diff --git a/common/lib/xmodule/xmodule/library_content_module.py b/common/lib/xmodule/xmodule/library_content_module.py
index 963efcad75..647e603c9c 100644
--- a/common/lib/xmodule/xmodule/library_content_module.py
+++ b/common/lib/xmodule/xmodule/library_content_module.py
@@ -306,10 +306,7 @@ class LibraryContentModule(LibraryContentFields, XModule, StudioEditableModule):
         current user.
         """
         for block_type, block_id in self.selected_children():
-            child = self.runtime.get_block(self.location.course_key.make_usage_key(block_type, block_id))
-            if child is None:
-                logger.info("Child not found for %s %s", str(block_type), str(block_id))
-            yield child
+            yield self.runtime.get_block(self.location.course_key.make_usage_key(block_type, block_id))
 
     def student_view(self, context):
         fragment = Fragment()
diff --git a/lms/djangoapps/discussion/views.py b/lms/djangoapps/discussion/views.py
index a4bb67aab4..7f41a24166 100644
--- a/lms/djangoapps/discussion/views.py
+++ b/lms/djangoapps/discussion/views.py
@@ -370,16 +370,10 @@ def _find_thread(request, course, discussion_id, thread_id):
             response_limit=request.GET.get("resp_limit")
         )
     except cc.utils.CommentClientRequestError:
-        log.info(u"Discussion Error: Thread ID:{thread_id} not found for Discussion: {discussion_id}".format(
-            thread_id=thread_id, discussion_id=discussion_id)
-        )
         return None
     # Verify that the student has access to this thread if belongs to a course discussion module
     thread_context = getattr(thread, "context", "course")
     if thread_context == "course" and not utils.discussion_category_id_access(course, request.user, discussion_id):
-        log.info(u'Discussion Error: Thread Context:{context} for thread: {thread}'.format(
-            context=thread_context, thread=thread.__dict__)
-        )
         return None
 
     # verify that the thread belongs to the requesting student's group
@@ -388,9 +382,6 @@ def _find_thread(request, course, discussion_id, thread_id):
     if is_commentable_divided(course.id, discussion_id, course_discussion_settings) and not is_moderator:
         user_group_id = get_group_id_for_user(request.user, course_discussion_settings)
         if getattr(thread, "group_id", None) is not None and user_group_id != thread.group_id:
-            log.info(u"Discussion Error: user_group:{user_group} is not equal to thread_group:{thread_group}".format(
-                user_group=user_group_id, thread_group=thread.group_id
-            ))
             return None
 
     return thread
diff --git a/openedx/core/djangoapps/user_api/models.py b/openedx/core/djangoapps/user_api/models.py
index 915814125e..673a6e7db0 100644
--- a/openedx/core/djangoapps/user_api/models.py
+++ b/openedx/core/djangoapps/user_api/models.py
@@ -3,8 +3,6 @@ Django ORM model specifications for the User API application
 """
 
 
-import logging
-
 from django.contrib.auth.models import User
 from django.core.validators import RegexValidator
 from django.db import models
@@ -33,8 +31,6 @@ from student.models import (
 )
 from util.model_utils import emit_setting_changed_event, get_changed_fields_dict
 
-log = logging.getLogger(__name__)
-
 
 class RetirementStateError(Exception):
     pass
@@ -104,9 +100,6 @@ def post_save_callback(sender, **kwargs):
     """
 
     user_preference = kwargs["instance"]
-    if user_preference.key == u'pref-lang':
-        log.info(u"Updated the language for the user:{username} to {new}".format(
-            username=user_preference.user.username, new=user_preference.value))
     emit_setting_changed_event(
         user_preference.user, sender._meta.db_table, user_preference.key,
         user_preference._old_value, user_preference.value  # pylint: disable=protected-access
diff --git a/openedx/core/djangoapps/user_api/preferences/api.py b/openedx/core/djangoapps/user_api/preferences/api.py
index 9b16a3b5d8..3b3915a0f4 100644
--- a/openedx/core/djangoapps/user_api/preferences/api.py
+++ b/openedx/core/djangoapps/user_api/preferences/api.py
@@ -117,9 +117,6 @@ def update_user_preferences(requesting_user, update, user=None):
     # First validate each preference setting
     errors = {}
     serializers = {}
-    if u'pref-lang' in update.keys():
-        log.info(u"Updating site language to {pref_lang} for the user: {username}"
-                 .format(pref_lang=update['pref-lang'], username=user))
     for preference_key in update.keys():
         preference_value = update[preference_key]
         if preference_value is not None:
@@ -149,7 +146,6 @@ def update_user_preferences(requesting_user, update, user=None):
             except Exception as error:
                 raise _create_preference_update_error(preference_key, preference_value, error)
         else:
-            log.info(u"Deleting language preference  for the user: {username}".format(username=user))
             delete_user_preference(requesting_user, preference_key)